Adjustable blade reamer



Feb. 13, 1945. M MACAFEE 2,369,587

ADJUSTABLE BLADE REAMER Filed Au 22, 1944 INVENTOR.

. Jnz'llard J1. Jifacc fee ITNESSES ATTOR NE Y5 close proximity and at invention, while the claims erence, designates a shank having a a 1 EN OFFICE ADJUSTABLE BLADE REAMER c Millard Mame, Brooklyn, N. Y.

Application Aug st 22, 1944, Serial No. 550,525

v c 1 v 7 Claims. This inventionrelatesto cutting tools, and has particular reference to certain improvements in an adjustable'blade reamer. f v I The invention primarily comprehends in' a reamer which includes a shank and blades mounted for radial inward and outward movement, 'an

, improved means for efiecting radial adjustments of the blades, which means serves to rigidly lock the sarneinadjusted position and which means further insures a propercentering of the blades with respect to the shank, in order that the tool will cut accurately any diameter within certain limits. I

The invention further contemplates an immeans for effecting the radial adjustments which the manipulating porelements are disposed in one extremity of the proved of reamer blades in tions of the adjusting .means, the economy with which it may be produced and the general efliciency derived therefrom.

With the above recited and other objects in view, reference is had to the following description and accompanying drawing, in which therefis exhibited one example or embodiment of the define the actual scope of the same.

In the drawing-- I Fig. 1 is an enlarged fragmentary side View of the reamer with parts broken away and shown in section to disclose the underlying structure.

Fig. 2 is an end view of the reamer on a reduced scale.

Fig. 3 is a perspective view of one of the reamer blades removed from the shank.

Referring to the drawing by characters of refhead 6 formed with radial slots l'diametri'cally opposite each other. From its outer free end the head is provided with a concentric internally threaded axial bore 8 which communicates with thejslots l. Reamer blades-9 of a suitable size and Leonfiguration are provided to snugly fit within; the slots 1 and are provided at their inner ends with axially projecting substantially V-shaped lugs or projections l0, each presenting an outer rounded or convex surface H and may be provided. An adjuster l3 having external threads M is threadedly engaged in the bore 8 a flat inner surface l2; --.While two blades are shown in the presentv instance, it is to be understood more than two blades adjust the blades inner end 20 which serves as a cam.

In use and operation, turning movement of the" adjuster in one direction to move the same axially inward effects the simultaneous radial inward movement of the blades 9 by virtue of the camming engagement of the frusto-conical periphery of the recess 15 with the outer converging faces I l of the lugs l 0. Conversely, turning movement of, the screw H3 in a direction to cause axial inward movement of said screw effects the simultaneous radial outward movement of the blades 9 due to the camming action set up by the conical end 20 with the inner converging faces H of the lugs Ill. It is, of course, obvious that to radially outwardly with the parts in the position illustrated in Fig. 1, it is first necessary to turn the adjuster in a direction to cause the same to move axially outward. After the proper outward adjustment has been made through the medium of the adjuster l3, the screw l8 will be screwed inwardly so that the end 20 will cooperate with the surface of the recess l5, to bind and lock the blades in their adjusted positions. When the blades are to be adjusted inwardly, the screw 18 is initially turned in a direction to move the same axially outward, after which the adjuster i3 is turned in a direction to move the same axially inward. If desired, the head 6 may be provided with grooves 2| extending radially from the bore 8 to facilitate the assembly of the reamer when new blades or substitute blades are being associated with the head. These grooves render the blade lugs l0 visible through the end 'of the head. By rounding or vex, the inner periphery of the frusto-conical recess is'reduced to a minimum. The inner flat faces l2, however, bear against the rounded periphery of the conical end 20.

I claim: v 1. An adjustable reamer including a head having a coaxial bore and radial blade holding slots communicating with said bore, blades occupying said slots respectively, said blades having projections, an adjuster operable in said bore having a conical surface which acts on said projections to adjust said blades radially inward simultaneforming the outerifaces ll con-, friction due to the cammingengagement of v ously, and an element which acts on said projections to adjust said blades radially outward simultaneously, and said element coacting with said adjuster and the projections to lock said blades in the adjusted position.

2. An adjustable reamer according to claim 1, wherein said bore is screw threaded, and said adjuster consists of a screw whose inner end embodies said conical surface.

3. An adjustable reamer according to claim 1, whereinsaid projections are similarly cut com? plemental to said conical surface.

4. An adjustable reamer according to claim 1,

wherein said bore is screw threaded, said ad- J'uster consists of a screw whose inner end emv bodies the conical surface, and said projections senting inner and outer converging are similarly cut complemental to said conical surface.

' 5. An adjustable reamer according to claim 1,

wherein said element consists of a set screw car.- ried by the adjuster coaxially thereof, theset screw having a conical surface which acts on said projections. I

6. An adjustable reamer including a head having a threaded coaxial bore and radial blade holding slots communicating with said bore, material removing blades occupying said slots respectively, said blades having V shape projections, an adjusting screw operable in said bore and having a cavity providing a conical surface outer faces of the lugs upon .movement of the. adjuster to effect simulin the inner end thereoc engaged with said projections for radially adjusting said blades equally and simultaneously, and a, pointed set screw operable in a tapped longitudinal bore in said adjusting screw engageable with said projections to cooperate with said adjusting screw for locking the blades in the adjusted position.

7. An adjustable blade reamer including a shank having radial slots and a threaded concentric axial bore communicating with said slots, aplurality of blades mounted in-said slots for radial inward and outward movement, axially projecting- V shaped lugs on said blades prebeveled faces, a threaded adjuster in said how having a frustoconical recess'at its inner end coacting with the inward axial taneous radial inward movement of the blades and a locking screw threaded axially and concentrically into said adjuster having a, conical inner end coacting with the inner rfaces of the blade lugs to effect simultaneous radial outward movement of said blades, the said adjuster and screw combining to secure the blades in their adjusted positions and the said outer face of the lugs being transversely rounded to reduce friction.

MILLARD K. MACAFEE. 

